Missed the second half of the show? Israeli Ambassador to the U.S. Michael Leiter, CBS News national correspondent and chief Washington analyst Robert Costa, Democratic Sen. Tim Kaine of Virginia and Ukraine's ambassador to the United States Olga Stefanishyna.

Energy Secretary Chris Wright said "what you're seeing is emotional reactions and fear that this is a long-term war." He stressed that "this is not a long-term war."

Sen. Tim Kaine, a Virginia Democrat, expressed regret on Sunday for supporting Kristi Noem for Department of Homeland Security secretary last year.

Olga Stefanishyna, the Ukrainian ambassador to the U.S., told "Face the Nation with Margaret Brennan" that Russia is "absolutely a factor" in the war with Iran as Russia was "investing in regimes like Iran, Venezuela, and Syria, just because they thought it's not possible to have the resolute action as it is now taking place with Iran and as it was before in Venezuela."

Democratic Sen. Tim Kaine of Virginia told "Face the Nation with Margaret Brennan" that his vote to confirm outgoing Homeland Security Secretary Kristin Noem was a "big mistake," and "what we want to see is not just the change in the nameplate on the door" from President Trump's new nominee Markwayne Mullin.